Source code for kyu_6.decipher_this.solution

#  Created by Egor Kostan.
#  GitHub: https://github.com/ikostan
#  LinkedIn: https://www.linkedin.com/in/egor-kostan/


def last_digit_index(word: str) -> int:
    index = 0
    for char in word:
        if char.isdigit():
            index += 1
        else:
            break

    return index


def decipher_this(string: str) -> str:
    """
    Given a secret message that you need to decipher.

    For each word:
     * the second and the last letter is switched (e.g. Hello becomes Holle)
     * the first letter is replaced by its character code (e.g. H becomes 72)

    Note: there are no special characters used, only letters and spaces

    :param string:
    :return:
    """
    if not string:
        return ""

    results = list()
    for word in string.split(' '):

        last_digit: int = last_digit_index(word)
        char: str = chr(int(word[0: last_digit]))

        if len(word[last_digit:]) == 0:
            results.append("{}".format(char))
        elif len(word[last_digit:]) == 1:
            results.append("{}{}".format(char,
                                         word[last_digit:]))
        elif len(word[last_digit:]) == 2:
            results.append("{}{}{}".format(char,
                                           word[-1],
                                           word[last_digit]))
        else:
            results.append("{}{}{}{}".format(char,
                                             word[-1],
                                             word[last_digit + 1: -1],
                                             word[last_digit]))

    return ' '.join(results)